Debian “buster” Release Information

The code name for the next major Debian release after stretch is buster.

This release started as a copy of stretch, and is currently in a state
called testing.
This means that things should not break as badly as in unstable or
experimental distributions, because packages are allowed to enter this
distribution only after a certain period of time has passed, and when they
don't have any release-critical bugs filed against them.

Please note that security updates for testing distribution are
not yet managed by the security team. Hence, testing does
not get security updates in a timely manner.
You are encouraged to switch your
sources.list entries from testing to stretch for the time being if you
need security support. See also the entry in the
Security Team's FAQ for
the testing distribution.

People often ask if there is a single release progress meter.
Unfortunately there isn't one, but we can refer you to several places
that describe things needed to be dealt with for the release to happen: